A 21-year-old man found dead on a Montebello street, alongside another young man with head injuries, fell off a car they were riding on in what appears to be a tragic accident, a sheriff’s lieutenant said Tuesday.

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A nephew of David Lugo Sr., father of the 21-year-old killed, is consoled at the scene. (EGP photo by Fred Zermeno)

David Christopher Lugo was pronounced dead at the scene, according to a coroner’s spokesman.

“Three men fell off the vehicle,” Lt. Holly Francisco of the sheriff’s Homicide Bureau said, adding it appeared to be a tragic accident.

The accident occurred on North Third Street about 4:40 a.m., and friends called for help, she said.

Witnesses at the scene told EGP they were awakened by an argument outside on the street.

One person, who asked to remain anonymous, said yelling was followed by the sound of a vehicle speeding away.

When the witness went outside to investigate, he saw two men lying on the street.

The victims were reportedly on top of the truck as it tried to leave the area, and fell off when the driver pulled to a stop, neighbors told EGP.

Sheriff’s deputies said they received reports of an argument before the accident, but could not confirm if there was an argument or just loud voices.

Friends and relatives flocked to the Lugo home throughout the day Tuesday. Relatives described Lugo Jr. as an “artist” who would work out with his father.

Sheriff’s deputies withheld the name of the other injured man, who was hospitalized with head injuries.

All of the parties are cooperating and we have no suspects,” Francisco said. The investigation is ongoing.